linux-kernel - [PATCH v2 2/2] MIPS: relocatable: Use __kaslr_offset in show_kernel

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Message-Id: <1612348510-29569-2-git-send-email-hejinyang@loongson.cn>
Date:   Wed,  3 Feb 2021 18:35:10 +0800
From:   Jinyang He <hejinyang@...ngson.cn>
To:     Thomas Bogendoerfer <tsbogend@...ha.franken.de>
Cc:     Huacai Chen <chenhuacai@...nel.org>,
        Jiaxun Yang <jiaxun.yang@...goat.com>,
        linux-mips@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v2 2/2] MIPS: relocatable: Use __kaslr_offset in show_kernel_relocation

The type of the VMLINUX_LOAD_ADDRESS macro is the (unsigned long long)
in 32bits kernel but (unsigned long) in the 64-bit kernel. Although there
is no error here, avoid using it to calculate kaslr_offset. And here we
may need is that the address of __kaslr_offset rather than (void *)offset.

Signed-off-by: Jinyang He <hejinyang@...ngson.cn>
---
 arch/mips/kernel/relocate.c | 8 ++------
 1 file changed, 2 insertions(+), 6 deletions(-)

diff --git a/arch/mips/kernel/relocate.c b/arch/mips/kernel/relocate.c
index 95abb9c..52018a3 100644
--- a/arch/mips/kernel/relocate.c
+++ b/arch/mips/kernel/relocate.c
@@ -430,13 +430,9 @@ void *__init relocate_kernel(void)
  */
 static void show_kernel_relocation(const char *level)
 {
-	unsigned long offset;
-
-	offset = __pa_symbol(_text) - __pa_symbol(VMLINUX_LOAD_ADDRESS);
-
-	if (IS_ENABLED(CONFIG_RELOCATABLE) && offset > 0) {
+	if (__kaslr_offset > 0) {
 		printk(level);
-		pr_cont("Kernel relocated by 0x%pK\n", (void *)offset);
+		pr_cont("Kernel relocated by 0x%pK\n", &__kaslr_offset);
 		pr_cont(" .text @ 0x%pK\n", _text);
 		pr_cont(" .data @ 0x%pK\n", _sdata);
 		pr_cont(" .bss  @ 0x%pK\n", __bss_start);
-- 
2.1.0